We currently run on 32bit windows and 32/64but solaris with near future plans to run on 64bit windows. The product is for a specific client so we can assume 4gb or more of physical ram.
As for Matlab, the problem is that the library routines for embedding matlab spawn a separate process and use IPC to talk to it (COM under windows I believe) so data sent is copied to another address space. Again, we can assume sufficient RAM for a data set and even if a page is swapped out to disk, it should be data that's not actively processing so the impact on performance should be less than processing directly on disk. ------------------------------ Trevor R.H. Clarke [EMAIL PROTECTED] Ball Aerospace & Technologies Corp -----Original Message----- From: Dave Korn [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 04, 2004 1:37 PM To: [EMAIL PROTECTED] Subject: RE: question about shared memory in the cygwin daemon > -----Original Message----- > From: cygwin-owner On Behalf Of Clarke, Trevor > Sent: 04 August 2004 17:54 > I'm currently developing image processing software which will > use matlab > as a "plugin" for interactive processing. The problem is, matlab, when > called from another program, spawns a separate matlab engine process. > The data we are working with can get very large (4gb+) so we > can't pass > copies of it around. We are looking at using cygwin's shared memory > functionality to get around this on windows (NT derivatives only). Your data won't even fit into a 32-bit address space, so I don't think shared memory is going to help you. Even if you're using an x86-64 platform, you have to bear in mind that you've got a virtual memory system there. If your data set is 4Gb, and your system RAM is < 4Gb, then even mapping it into shared memory between processes will involve it going out to disk and back when the pagefile starts swapping. Is there not a library version of matlab you can link to your application and call into from the same process space? cheers, DaveK -- Can't think of a witty .sigline today....
BEGIN:VCARD VERSION:2.1 N:Clarke;Trevor FN:Clarke, Trevor ORG:Ball Aerospace & Technologies Corporation;14671101 TEL;WORK;VOICE:(937) 320-7087 EMAIL;PREF;INTERNET:[EMAIL PROTECTED] REV:20040707T203457Z END:VCARD
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